Quantcast FIREFIGHTING SYSTEM - TM-5-4210-233-14P-1_26

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BRAKE  SYSTEM. - TM-5-4210-233-14P-1_25
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TM-5-4210-233-14P-1 Twin Agent 4x4 Firefighting Truck Model No. CM-KFT-B Manual
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AERIAL LADDER/WATER TOWER - TM-5-4210-233-14P-1_27
TM 5-4210-233-14&P-1 1-16.  BRAKE SYSTEM - Continued c.  Front Brake System. (1)  To engage the front brakes, air pressure is supplied from the front service reservoir via the brake valve assembly (front), quick release valve, to the front wheel brake air chambers.  When the brake pedal is released, the air pressure exhausts.  Without pressure, the quick release valve opens and vents the air chambers to atmosphere, thereby releasing the brakes. (2)  The front brake system is operational only when the front service reservoir is pressurized. 1-17.  FIREFIGHTING SYSTEM  Controls are provided in the cab and on the structural control panel to enable firefighting.    The  system  is  controlled  from  the  operator  station.    Pump  engagement  and  disengagement, however, is always controlled from the cab. CAUTION To prevent inrush surges and engine overspeeding, water must always  be  available  at  the  pump  before  it  is  engaged.  While operating,   water   supply   to   the   pump   must   be   continuous.   If discontinued,   the   pump   must   be   shut   down   immediately   to prevent damage. The pump must be disengaged immediately when the watertank is emptied.  Failure to do this can cause vehicle damage due to engine overspeeding. a.  Water supply and discharge system. (1)  Water supply can be from tank or alternative sources via the suction manifold.  The alternative sources may  be  fire  hydrants,  remote  pumping  units  or  an  open  reservoir.    If  water  is  drawn  from  tank  a continuous supply must be secured via the automatic tank fill valve. (2)  Automatic priming of the fire pump takes place if the pump is void of water when initially engaged.  The priming pump, driven by the fire pump, evacuates the fire pump suction.  As soon as water pressure is available, the priming pump automatically disengages. (3)  From the pump the water flows via the discharge manifold to the aerial and hand line valves. b.  Foam Induction System. (1)  Foam concentrate is released from the foam tank and metered into the water flow to the pump.  The control valves through which the concentrate is released and metered are operated from the operator's station. To produce foam, water (derived from the pump discharge) is cycled through the eductor and into the pump suction. In the eductor, the water draws foam concentrate into the flow by venturi action. (2)  To remove residual foam from the foam lines after firefighting, the foam tank valve is closed and the flush valve is opened. Water from the pump discharge is then cycled through the metering valve and the eductor. 1-19

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